1、OkHttp框架使用了OkIo框架，不要忘记下OkIo.jar

2、通过POST访问网络，和通过GET访问网络基本相同，多了设置请求参数的过程。主要分为五步：

    (1)、声明并实例化一个OkHttpClient对象

    (2)、声明并实例化一个RequestBody对象

    (3)、声明并实例化一个Request对象

    (4)、执行Request请求，并得到一个Response对象

    (5)、根据Response的isSuccessful()方法判断是否成功，然后从Response对象中获取返回数据。

3、

public class PostActivity extends Activity {    private OkHttpClient client = new OkHttpClient();        private TextView mTvPost;        private String url = "https://www.baidu.com/";        private String result = "";    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_post);                initView();                new Thread(postThread).start();    }        public void initView(){        mTvPost = (TextView) findViewById(R.id.tv_post_show);    }        private Handler postHandler = new Handler(){        public void handleMessage(android.os.Message msg) {            mTvPost.setText(result);        };    };        private Thread postThread = new Thread(){        public void run() {            try {                run();            } catch (Exception e) {                // TODO Auto-generated catch block                e.printStackTrace();            }                        postHandler.sendEmptyMessage(0);        };    };    /** Posting a String */    public static final MediaType jsonReq = MediaType.parse("application/json;charset=utf-8");    public void run() throws IOException {        RequestBody body = RequestBody.create(jsonReq, "{\"name\", \"name\"}");        Request request = new Request.Builder().url(url).post(body).build();        Response response = client.newCall(request).execute();        result += response.body().string();    }    /** Posting a File */    public static final MediaType MEDIA_TYPE_MARKDOWN1 = MediaType.parse("text/x-markdown;charset=utf-8");    public void run2() throws Exception {        File file = new File(Environment.getExternalStorageDirectory().getPath() + "/DCIM/Camera/IMG_20151030_205855.jpg");        Request request = new Request.Builder().url(url).post(RequestBody.create(MEDIA_TYPE_MARKDOWN, file)).build();        Response response = client.newCall(request).execute();        if (!response.isSuccessful()){            result += "出错" + response;        }else{            result += "没有出错" +response.body().string();        }    }    /** Posting from parameters */    public void run3() throws Exception {        RequestBody formBody = new FormEncodingBuilder().add("search","Jurassic Park").build();        Request request = new Request.Builder().url(url).post(formBody).build();        Response response = client.newCall(request).execute();                if (!response.isSuccessful()){            result += "出错了";        }else{            result += response.body().toString();        }    }    /** Posing Json with Gson */    private final Gson gson = new Gson();    public void run5() throws Exception {        Request request = new Request.Builder().url(url).build();        Response response = client.newCall(request).execute();        if (!response.isSuccessful()){            result += "出错了";        }else{            Gist gist = gson.fromJson(response.body().charStream(), Gist.class);            for (Map.Entry
     
       entry : gist.files.entrySet()) {                result += entry.getKey() + entry.getValue().content;            }        }    }    static class Gist {        Map
      
        files;    }    static class GistFile {        String content;    }}
      
     

4、访问网络不能在主线程中进行，还有不要忘记加入访问网络的权限。

5、对于Request对象是如何实例化的，大家可以参考--java builder模式

http://www.cnblogs.com/moonz-wu/archive/2011/01/11/1932473.html

6、参考博文：

http://www.2cto.com/kf/201505/397557.html